On Wed, Sep 23, 2015 at 12:41:55AM -0400, Dan Williams wrote: > Enable DAX to use a reference count for keeping the virtual address > returned by ->direct_access() valid for the duration of its usage in > fs/dax.c, or otherwise hold off blk_cleanup_queue() while > pmem_make_request is active. The blk-mq code is already in a position > to need low overhead referece counting for races against request_queue > destruction (blk_cleanup_queue()). Given DAX-enabled block drivers do > not enable blk-mq, share the storage in 'struct request_queue' between > the two implementations. Can we just move the refcounting to common code with the same field name, and even initialize it for non-mq, non-dax queues but just never tage a reference there (for now)? -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
